Knowledge is power ,

sharing knowledge is powerful

بوسى
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منذ 7 سنوات
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علق جسم فى ميزان زنبركى مثبت فى سقف مصعد فسجل الميزان القراءة 7 ث كجم عندما كان 

المصعد ساكنا تم سجل القراءة 8 ث كجم  عندما تحرك  المصعد راسيا بعجلة منتظمة  اوجد مقدار

واتجاه العجلة التى يتحرك بها المصعد 

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